JP2000145787A - Rolling bearing holder and rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holder capable of stably supplying the base oil separated from grease to a rolling element. SOLUTION: A pair of circumferentially opposed claws 32 is formed on one side of an annular body 31 at equal circumferential intervals to form a pocket 33 for holding a rolling element 20 between the opposed claws 32. A grease scattering preventing wall 34 is formed extending between a pair of claws 32 between the pockets 33 adjacent to the circumferential part of the one side surface of the annular body 1 to provide a grease basin 35 in the bore side thereof, and grease is held by the grease basin 35. A cutout part 36 is formed on the inside part on the side surface of the grease basin 35 to carry the base oil separated from the grease into circumferential stripes 37 provided on the inside surface of the annular body 31 through the cutout part 36, and the base oil is run along the stripes 37 and supplied to the surface of the rolling element 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grease lubricated cage for a rolling bearing and a rolling bearing.

[0002]

2. Description of the Related Art A rotating shaft of a fan motor or a cleaner motor is rotatably supported by a small-diameter rolling bearing such as a miniature bearing in which a rolling element incorporated between an outer ring and an inner ring is held by a retainer.

[0003] Since the rotating shaft is rotated at an extremely high speed, if lubrication failure occurs in a rolling bearing that supports the rotating shaft, frictional resistance increases and the load torque of the motor increases, or the bearing wears. And the life of the bearing is reduced.

[0004] Therefore, good lubricity is demanded in the rolling bearings.

To improve the lubrication life of rolling bearings,
The base oil viscosity of lubricating greases has been increased, and antioxidants as additives have been improved.

[0006]

By the way, improvement of lubricating grease alone cannot stably supply necessary lubricating oil to a contact portion between a rolling element of a rolling bearing and a raceway surface, thereby improving lubrication life. There are still points to be improved.

An object of the present invention is to provide a cage for a rolling bearing and a rolling bearing capable of stably supplying lubricating oil to a contact portion between a rolling element and a raceway surface.

[0008]

In order to solve the above-mentioned problems, in a cage according to the present invention, a pair of claws circumferentially opposed to one side surface of an annular body are formed at equal intervals to form a pair of claws. In a cage for a rolling bearing provided with a pocket for holding a rolling element therebetween, a configuration is employed in which a plurality of stripes are formed over a pocket adjacent to at least an inner diameter surface of the annular body.

With the above construction, when the base oil separated from the grease flows into the streaks, the base oil flows along the streaks by rotation of the retainer and is sent into the pockets. The base oil can be stably supplied to the outer periphery of the rolling element that has been made. Such streaks may be provided on the outer diameter surface of the annular body.

Here, a grease scattering prevention wall is formed on an outer peripheral portion on one side surface of the annular body and extends between a pair of claws between adjacent pockets, and a grease reservoir is provided on an inner diameter side thereof, and a side surface of the grease reservoir is provided. When a notch is formed at the inner periphery of the annular body to reach the inner diameter surface of the annular body, the grease can be held by the grease pool, and the base oil in the grease flows from the notch into the streaks due to the capillary phenomenon. Base oil can be supplied more stably.

The retainer may be a molded product of a synthetic resin or a cut product. In such a cage, the lubricating oil adhering to the streaks flows along the streaks at the beginning of rotation of the cage by attaching the lubricating oil to the surface in advance, so that the ball is applied to the ball from the beginning of the rotation of the cage. In addition to supplying lubricating oil, the movement of the lubricating oil provides a way to guide the base oil into the pocket, so that the base oil separated from the grease can flow smoothly into the pocket.

In the rolling bearing according to the present invention, a rolling element is incorporated between a raceway groove formed on the inner diameter surface of the outer ring and a raceway groove formed on the outer diameter surface of the inner ring, and the rolling element is provided with a streak on the inner diameter surface. A configuration is employed in which the holding unit is provided by the provided holder or a holder having a grease reservoir.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. As shown, the rolling bearing
It comprises an outer ring 1, an inner ring 10, a rolling element 20 and a retainer 30. A raceway groove 2 is formed on the inner diameter surface of the outer ring 1, while a raceway groove 11 is provided on the outer diameter surface of the inner ring 10.

The ball 20 is composed of the raceway groove 2 of the outer race 1 and the inner race 10
Are integrated between the raceway grooves 11. The retainer 30 that holds the rolling elements 20 is a synthetic resin molded product. The retainer 30 is formed with a pair of claws 32 circumferentially opposed to one side surface of an annular body 31 at equal intervals in a circumferential direction, and a pocket 33 that partially enters the annular body 31 between the pair of claws. The rolling element 20 is accommodated in each pocket 33.

A grease scattering prevention wall 34 extending between a pair of claws 32 between adjacent pockets 33 is provided on an outer peripheral portion on one side surface of the annular body 31.

A space surrounded by the grease scattering prevention wall 34 and the pair of claws 32 is a grease reservoir 35, and a notch 36 reaching the inner diameter surface of the annular body 31 is provided on an inner peripheral portion on a side surface of the grease reservoir 35. Have been.

A plurality of circumferentially extending streaks 37 are provided on one side of the outer diameter surface and the inner diameter surface of the annular body 31, the outer diameter surface of the grease scattering prevention wall 34, and the inner diameter surface of the pair of claws 32. Are formed, and the end of each streak 37 is a pocket 3
3 has been reached.

The streaks 37 may be formed only on one side of the inner surface of the annular body 31. The grease scattering prevention wall 34 may be provided at a position on the inner diameter side of the outer diameter surface of the pair of claws 32, and the formation position is determined by the amount of grease sealed in the grease reservoir 35.

The rolling bearing having the above configuration is used by filling grease into a grease reservoir 35 formed in the retainer 30. In this use, the retainer 30 rotates due to the relative rotation of the outer ring 1 and the inner ring 10, and centrifugal force acts on the grease to move in the outer diameter direction, but the grease scatters on the outer diameter side of the grease reservoir 35. Since the prevention wall 34 is provided, the grease does not flow out in the outer diameter direction, and is kept in a state sealed in the grease reservoir 35.

Here, since the notch 36 is provided in the inner peripheral portion on the side surface of the grease reservoir 35, the base oil is separated from the grease that comes into contact with the notch 36 by capillary action. The separated base oil flows along the inner surface of the retainer 30 along the notch 36 and flows into the streaks 37. The streaks 37 extend in the circumferential direction of the retainer 30 and the ends are pockets 3.
3, the rotation of the retainer 30 causes the streaks 3
The base oil in 7 flows along the streaks 37 and is supplied to the rolling elements 20, and the contact portions between the rolling elements 20 and the raceway grooves 2, 11 are lubricated by the base oil.

As described above, the base oil separated from the grease flows from the notch portion 36 to the streaks 37 and is guided by the streaks 37 to be supplied to the rolling elements 20, so that the base oil as lubricating oil is supplied to the rolling elements 20. It can be supplied stably.

If lubricating oil is applied to the surface of the cage 30 in advance, the lubricating oil that has entered the streaks 37 flows along the streaks 37 from the initial rotation of the cage 30 and
And the passage of the lubricating oil provides a way to guide the base oil to the pockets 33, so that the base oil separated from the grease and flowing into the streaks 37 can flow smoothly toward the pockets 33. it can.

[0023]

As described above, in the present invention, when the base oil flows into the streaks provided on the inner diameter surface of the cage, the base oil flows along the streaks by the rotation of the cage and is supplied to the rolling elements. Therefore, base oil can be stably supplied to the rolling elements, friction and wear of the contact portions between the rolling elements and the outer and inner rings can be reduced, and the life of the bearing can be improved.

Further, by forming a grease scattering prevention wall extending between a pair of claws between adjacent pockets and providing a grease reservoir on an inner diameter side thereof, the grease can be stably held, and the grease reservoir can be stably held. The base oil separated from the grease can be satisfactorily guided to the streaks by forming the notch in the inner peripheral portion on the side surface of the roller, and the base oil can be more stably supplied to the rolling elements.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an enlarged part of the above.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a perspective view showing a part of the cage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Track groove 10 Inner ring 11 Track groove 20 Rolling element 30 Cage 31 Annular body 32 Claw 33 Pocket 34 Grease scattering prevention wall 35 Grease pool 36 Notch section 37

Claims (5)

[Claims] 1. A retainer for a rolling bearing in which a pair of claws circumferentially opposed to one side surface of an annular body are formed at equal intervals and a pocket for holding a rolling element is provided between the pair of claws. Characterized in that a plurality of stripes extending over adjacent pockets are formed on at least the inner diameter surface of the roller bearing. 2. An outer peripheral portion on one side surface of the annular body,
Forming a grease scattering prevention wall extending between a pair of claws between adjacent pockets, providing a grease reservoir on its inner diameter side,
The retainer for a rolling bearing according to claim 1, wherein a cutout portion is formed in an inner peripheral portion of a side surface of the grease reservoir to reach an inner diameter surface of the annular body. 3. The rolling bearing retainer according to claim 1, wherein the whole is made of a synthetic resin. 4. The rolling bearing retainer according to claim 2, wherein a streak extending over an adjacent pocket surface is formed on an outer diameter surface of the grease scattering prevention wall. 5. A rolling element is assembled between a raceway groove formed on an inner diameter surface of an outer ring and a raceway groove formed on an outer diameter surface of an inner ring, and the rolling element according to any one of claims 1 to 4, A rolling bearing characterized by being held by a rolling bearing retainer.